WO2006025147A1

WO2006025147A1 - Method of draw-and-iron processing of resin clad metal sheet, and resin clad draw-and-iron processed can produced thereby

Info

Publication number: WO2006025147A1
Application number: PCT/JP2005/011704
Authority: WO
Inventors: Shinichi Taya; Masahiro Kai; Junichi Tanabe; Etsuro Tutsumi; Norihito Saiki
Original assignee: Toyo Kohan Co., Ltd.; Toyo Seikan Kaisha, Ltd.
Priority date: 2004-09-02
Filing date: 2005-06-27
Publication date: 2006-03-09
Also published as: US7878040B2; KR101029230B1; US20090013751A1; EP1787736B1; EP1787736A4; CN101031373B; KR20070050055A; EP1787736A1; JP4628047B2; JP2006068779A; CN101031373A

Abstract

A method of draw-and-iron processing of a resin clad metal sheet, in which in the draw-and-iron processing of resin clad metal sheet, there can be obtained a can body of satisfactorily small wall thickness and at an opening edge part of the can body, the cladding resin is free from any defect; and a resin clad draw-and-iron processed can produced thereby. There is provided a method of draw-and-iron processing of a resin clad metal sheet, comprising performing draw-and-iron processing of a resin clad metal sheet composed of a metal sheet having at least one major surface thereof clad with an organic resin with the use of a punch and a die into a can body, characterized in that ironing is conducted with the use of a punch having a small-diameter portion at its rear end so that the ratio of ironing at an opening edge part of the can body after shaping falls within the range of 0 to 15%. Further, there is provided a draw-and-iron processed can of resin clad metal sheet produced through the processing method.

Description

Specification

Method of drawing and ironing resin-coated metal plates, and resin-coated drawn ironing cans using the same

TECHNICAL FIELD [0001] The present invention relates to a method for drawing and ironing a resin-coated metal plate, and in particular, it is possible to sufficiently reduce the thickness of a can side wall without generating oiled hair at the opening end of a can body during ironing. The present invention relates to a possible processing method and a slag coated squeezed iron can using the same.

Background art

A squeezed iron can has been conventionally processed as shown in FIG. In other words, the metal plate force is also punched into a blank, the blank is processed into a cup by drawing, and then the drawn cup is attached to the punch using the ironing device consisting of punch 2 and multi-stage ironing die 3. Next, the cup is finished with a predetermined can side wall thickness and can height by inserting the cup together with the punch into the ironing die. In drawing and ironing, large amounts of lubricating oil and cooling water are used for lubrication and cooling during processing.

[0003] However, in recent years, from the viewpoint of environmental protection and further reduction of the weight of the can body, a can body made of a resin-coated metal plate that has been conventionally processed by a method mainly using a drawing process is ironed. Therefore, an attempt is being made to further thin the side wall of the can. However, when processing a drawn iron can with a conventional squeezed iron can as shown in Fig. 1, if the squeezed iron can is processed, the organic oil If coated on the metal plate lm is a metal. Because it is softer than the plate, the organic resin in the vicinity of the opening end of the can body is exposed to the extremely large pressure between the tool Z materials generated during the ironing process, as shown in Fig. 1. After being pushed out from the part, it is cut and the thread-like cutting waste indicated by lh (hereinafter referred to as “grease hair”) is generated. Such greaves hair tends to occur especially when the total ironing ratio in the ironing process after drawing is 15% or more. Resin-coated metal sheet strength When slagging hair is generated in the process of continuously making squeezed and ironing cans, the generated sallowing hair is attached to the punch or ironing die, so that the squeezing can that is next subjected to ironing processing The coating resin on the surface of the can body is damaged. Less than As described above, it is very difficult to process a squeezed iron can by using a conventional squeezed iron can processing apparatus.

[0004] As a method for preventing the fat resin generated when processing the resin-coated metal sheet into a can, the circular organic resin-coated metal sheet is held by an annular holding member and a drawing die. The drawing punch and the drawing die provided so as to be coaxial with the member plate and the drawing die and capable of entering and exiting the holding member are moved relative to each other so as to alternately hold, and the circular metal plate is drawn into the drawing cup. In the processing method, at least one of the annular holding member and the drawing die that pressed the remaining flange portion immediately before the drawing process is moved away from the pressing force, and the rear end of the flange portion is opened. A method for preventing the occurrence of rosin hair by narrowing down is disclosed (for example, see Patent Document 1).

[0005] This method is intended to prevent the occurrence of oily hair when forming a squeezing cup. In the drawing process, an annular holding member and a squeeze die are respectively arranged on the same axis. Force that enables such means because it can be moved to a position In the ironing process of the drawing ironing cabinet, which is the means for achieving the object of the present invention, the punch passes through the inner diameter portion of the ironing die. Since the inner diameter of the ironing die and the outer diameter of the punch cannot be changed during processing, the strong pressure between the tool Z material generated during ironing of the resin-coated metal is as described above. It cannot be opened.

[0006] Prior art document information relating to the present application includes the following.

Patent Document 1: Japanese Patent Laid-Open No. 05-154570

Disclosure of the invention

Problems to be solved by the invention

[0007] The present invention provides a can body in which the thickness of the can body side wall is sufficiently thin in the ironing process of the drawing force consisting of the resin-coated metal sheet coated with at least one surface of the metal sheet, and It is an object of the present invention to provide a method of ironing a resin-coated metal plate that does not generate a resinous hair at the open end of the can body, and a resin-coated squeezed ironing can using the same. A further object of the present invention is to reduce the distance between lands of at least two stages of dies as much as possible, for example, when connecting dies and performing ironing with a two-stage die, Can body side per step of ironing by effectively using knock tension generated by ironing unit A uniform and uniform organic resin-coated metal sheet in the circumferential direction of the can body by improving the wall thickness reduction rate (limit ironing ratio) and greatly reducing the radial deformation of the ironing die at the subsequent stage. It is in providing the ironing method.

Means for solving the problem

[0008] The method of drawing and ironing a resin-coated metal sheet according to the present invention is a method of drawing and ironing a resin-coated metal sheet obtained by coating an organic resin on at least one surface of a metal sheet using a punch and a die. In the squeezing and squeezing process of the resin-coated metal sheet to be formed into a can body, a punch having a small diameter portion at the rear end portion is used, and the ironing ratio of the open end portion of the can body after forming is 0 to 15%. It is characterized by ironing.

In this case, a plurality of dies are used as dies for ironing, and at least two dies are arranged so that the distance between lands is 3 to 40 mm, and 20% or more of the total ironing amount by the two dies. It is desirable to apply the squeezing force to the former die of the two dies. In addition, it is desirable to perform the ironing process by installing the former die and the latter die in a continuous state in the two dies.

The drawn and ironed can of the resin-coated metal sheet according to the present invention is characterized by being formed using any of the ironing methods described above.

Brief Description of Drawings

FIG. 1 is a schematic cross-sectional view showing a part of a process of ironing a drawing cup having a conventional resin-coated metal sheet force.

[FIG. 2] FIG. 2 is a schematic cross-sectional view showing an example of a process for ironing a drawing cup having a resin-coated metal sheet force according to the present invention.

FIG. 3 is a schematic cross-sectional view showing another example of the process of ironing the drawing cup having the resin-coated metal sheet force of the present invention.

[FIG. 4] FIG. 4 is a schematic cross-sectional view showing another example of the process of ironing the drawing cup having the resin-coated metal sheet force of the present invention.

FIG. 5 is a schematic cross-sectional view showing another example of the process of ironing the drawing cup having the resin-coated metal sheet force of the present invention.

[Fig. 6] Fig. 6 shows a process of ironing a drawing cup having a resin coated metal sheet force according to the present invention. It is a schematic sectional drawing which shows a part of. In the figure, 1 is the squeeze cup, If is the organic resin, lm is the metal plate, lh is the resin hair, 2 is the ironing punch, 2a is the ironing punch, 2b is the small diameter part 3a is the first ironing die, 3b is the second ironing die, 4a is the first ironing die approach, 4b is the second ironing die approach, 5a Is the land portion of the front ironing die, 5b is the land portion of the post ironing die, 6a is the exit surface of the front ironing die, 6b is the outlet surface of the post ironing die, and 7 is ironing. Stress indicates 8 and back tension.

BEST MODE FOR CARRYING OUT THE INVENTION

In the present invention, the squeezed iron can is covered as follows. In other words, the blanks were first punched with a conventional method, and the blank was formed into a cup by drawing, and then the ironing rate of the opening end of the can body was 0 to 15 as shown in FIG. % Using a ironing machine consisting of a punch 2a with a small diameter part or taper part 2b and an ironing die 3 placed in front of the punch 2a, the drawn cup 1 is mounted on the punch and the punch cup together with the punch 2a. Ironing die 1 with 1 placed inside and ironing inside, reducing the can side wall of the squeeze cup 1 and increasing the height of the can body. Furthermore, a punch having a small-diameter portion or a taper portion that has a squeezing rate at the opening end of the can body of ~ 10% is more preferable. The ironing rate was calculated by comparing the thickness of the cans processed by ironing with the thickness measured after lmm from the lowest can height, and the thickness before caulking. When the opening end of the can passes through the ironing die 3, the size of the gap between the small diameter of the punch 2a and the inner diameter of the ironing die 3 is set to be greater than the damage limit of the coating resin, The coating resin at the opening end of the can is not ironed beyond the damage limit. Therefore, the drawn cup 1 attached to the punch 2a and ironed has a thick portion formed in the vicinity of the opening of the can body, and does not generate grease hair at the opening end of the can body. The portion 2b with a small diameter of the punch 2a may be provided as a straight stepped portion, but the diameter gradually decreases in a tapered shape so that the diameter is not subjected to ironing from the middle of the tapered portion. It is preferable that the ironing pressure is gradually released. This taper shape should have a point force that is at least 3 mm higher than the final can height (trim position). The taper angle is preferably 0.1-30 °. More desirably, the angle is 0.5 to 5 °. When the taper angle is less than 0.1 ° If it exceeds 30 °, which has no effect on the occurrence of rosive hair, it tends to be a problem in terms of punch strength or punch vibration during ironing.

[0011] Another method is a method in which at least two dies are used and the distance between the lands of these two dies is set to 3 to 40 mm to perform ironing. These two dies can be integrated into one with two squeezed parts, one with two dies connected without any intervening space, or with a spacer between them. One with two dies installed can be used. Compared to the case described above, the method of performing the ironing process by arranging the distance between the lands of the two dies at 3 to 40 mm is desirable in terms of the ability to remove the can after the ironing process. As an example, Figures 3 to 6 show the case where ironing dies are connected in series. In addition, the limit ironing rate per step of ironing is improved to about 64%, and cans with a higher can height can be obtained without the occurrence of rosin hair.

First, as shown in FIG. 3, a punch 2a having a small-diameter portion 2b that is not subjected to ironing at the opening end of the can body, and ironing molds 3a and 3b arranged continuously in front of the punch 2a. Using the ironing machine, continue to attach the drawn cup 1 to the punch 2a as shown in Fig. 4 and insert it into the ironing dies 3a and 3b, which are arranged together with the punch 2a. Then, ironing is performed to reduce the can side wall thickness of the squeeze cup 1 and increase the height of the can body. When the opening end of the can passes through the ironing dies 3a and 3b, the diameter of the punch 2a is reduced and the gap between the inner diameters of the ironing dies 3a and 3b is set to exceed the damage limit of the coating resin. Therefore, the coating resin at the opening end of the can body is not subjected to ironing processing exceeding the damage limit. Therefore, the drawn cup 1 attached to the punch 2a and ironed is formed with a thick portion at the opening end portion of the can body, so that no grease hair is generated at the opening end portion. The portion 2b with a small diameter of the punch 2a may be provided as a straight stepped portion, but the diameter gradually decreases in a tapered shape so that the diameter is not subjected to ironing from the middle of the tapered portion. It is preferable that the ironing pressure is gradually released. In other words, it is desirable that this tapered shape has a location force that is at least 3 mm higher than the location (trim position) where the final can height is reached. The taper angle is preferably 0.1-30 °. More desirably, the angle is 0.5 to 5 °. If the taper angle is less than 0.1 °, the effect on the generation of oiled hair is not achieved. If the taper angle exceeds 30 °, the strength of the punch or the vibration of the punch during ironing tends to be a problem. [0013] In Fig. 6 showing an example of a continuous ironing force die used in the present invention, this ironing portion comprises a preceding ironing force portion 3a and a subsequent ironing force portion 3b. Each part of the former and subsequent ironing parts has die approach parts 4a and 4b, land parts 5a and 5b, and outlet surfaces 6a and 6b. Each of these ironing parts has the same function as each ironing part in a known ironing die, but in the present invention, the ironing parts at the front and rear stages are connected in series. In the subsequent ironing force check, the axial forming stress 7 generated by the former ironing part is effectively used as the back tension 8, and the limit ironing rate per ironing process is improved. Deformation in the radial direction of the ironing die at the subsequent stage is greatly reduced, enabling uniform and uniform ironing.

[0014] The continuous arrangement means that the former ironing portion 3a and the latter ironing portion 3b are connected in a state of being inserted simultaneously into the punch ironing portion. The former ironing part 3a and the latter ironing part 3b are preferably configured separately. In addition, one that has two die-loading irons or that has two dies with a spacer interposed between them can be used.

[0015] The ability to effectively use the back tension of the former ironing part 3a to improve the limit ironing rate in ironing and to suppress the radial deformation of the ironing die in the latter stage is It is effective that the distance L between the lands in the front and rear stages is shorter, and the distance L between the lands is preferably 40 mm or less. Even if it exceeds 40 mm, there is an effect of back tension, but when trimming, the material to be removed increases, which is not preferable in terms of economy. From such a viewpoint of resource saving, the shorter distance L between lands is effective in reducing the volume of the thick portion at the opening end of the can body, and is preferably in the range of 3 to 40 mm. Furthermore, the range of 3-20 mm is more preferable.

[0016] In the present invention, it is preferable that the ironing amount of the former ironing portion is 20% or more of the sum of the ironing amounts of the former ironing portion and the latter ironing portion. The upstream ironing part and the downstream ironing part are connected in series, and the ironing part with a specific ratio or more is applied in the upstream ironing part, so that the back ironing part has an appropriate back tension. You can apply squeezing power while you are. Therefore, the radial stress of the ironing die is reduced in the ironing part in the subsequent stage. Due to this reduction effect, the die approach Deformation in the radial direction of the ironing die, which is a drawback when the corner is reduced, is suppressed. If the ironing amount of the former ironing part is 20% or less of the sum of the ironing amounts of the former ironing part and the latter ironing part, the molding stress of the former ironing part is reduced. Since the back tension acting on the subsequent ironing part is reduced, the effect of improving the ironing workability in the latter ironing part and the effect of suppressing the radial deformation of the ironing die in the latter part cannot be sufficiently obtained. ,.

[0017] The method for ironing the organic resin-coated metal sheet of the present invention can be applied to both conventional ironing using a lubricating oil and cooling water and dry ironing using a high-temperature volatile lubricating oil. .

[0018] As described above, according to the present invention, in the squeezing and squeezing process of the organic sachet-coated metal plate, sachet hair is not generated at the opening end of the can body by the squeezing process. In addition, by setting the distance between lands between dies to 3 to 40 mm, the limit ironing rate per step of ironing cabinet, which is about 55% in the conventional ironing process, is improved to about 64%, and the latter stage It is possible to suppress the radial deformation of the ironing die to 50% or less of the conventional ironing method.

[0019] In the embodiments described later, the continuous upstream and downstream ironing portions in the present invention are installed as the first ironing portion, but in front of the continuous upstream and downstream ironing portions. In this process, ironing is performed within a range that does not exceed the damage limit of the coated organic resin, and in order to improve the punching ability of the can body with punching force in the subsequent process of the upstream and downstream ironing parts. It is also possible to perform drawing and ironing by a multi-stage ironing process such as applying ironing force of less than%.

[0020] The ironing method of the present invention comprises electrolytic chromic steel having a two-layer structure in which the lower layer is metallic chromium and the upper layer is chromium hydrated oxide, various plated steel sheets such as tinplate, surface-treated steel sheets, stainless steel Metal plates such as polyester steel, polyolefin resin, and polyamide resin coated on both sides of metal plates such as stainless steel plate, aluminum plate and aluminum alloy plate, and thermoplastic resin Also, it is particularly effective when a metal plate coated with a thermosetting resin or a pigment, filler, etc. is blended in the above organic resin and drawn and ironed metal resin coated metal sheet. is there. The thickness of the organic resin film is 5 ~ 100 μm is desirable. The resin film applied to the present invention can be either a single layer film or a multilayer film having two or more layers, and is preferably a thermoplastic resin, particularly a polyester resin.

[0021] As the polyester resin, those having an ester unit such as ethylene terephthalate, ethylene isophthalate, butylene terephthalate, butylene isophthalate are preferable, and at least one ester unit selected from among them is further used. The polyester is preferred. At this time, each ester unit may be copolymerized, or a homopolymer or copolymer of two or more types of ester units may be blended and used. Other than the above, those using naphthalenedirubonic acid, adipic acid, sebacic acid, trimellitic acid, etc. as the acid component of the ester unit, etc., and propylene glycol, diethylene glycol, neopenic as the alcohol component of the ester unit, etc. Those using tildaricol, cyclohexanedimethanol, pentaerythritol, or the like may be used.

The polyester may be a homopolyester or a copolyester, or a laminate of two or more polyester layers having a blend strength of two or more. For example, the lower layer of the polyester film can be a copolyester layer having excellent thermal adhesion, and the upper layer can be a polyester layer or modified polyester layer having excellent strength, heat resistance, and barrier properties against corrosive components.

[0022] In the present invention, both a uniaxially or biaxially stretched film and an unstretched film can be applied. However, it is desirable to use a film made of unstretched polyester resin for the surface-treated steel sheet. Even when laminating, the resin is cut or the surface-treated steel sheet with the polyester resin film laminated to the surface-treated steel sheet is subjected to severe forming processes such as drawing and drawing and ironing, and the resin can be scraped or scratched. In order to prevent the occurrence of cracks, cracks, and further peeling, it is necessary to increase the intrinsic viscosity of the resin and strengthen the resin.

For this reason, it is more preferable that the intrinsic viscosity of the above-mentioned polyester resin is in the range of 0.6 to 1.4, more preferably in the range of 0.8 to 1.2. Polyester with an intrinsic viscosity of less than 0.6 When using a resin, the strength of the resin decreases drastically, and drawing or ironing is performed. It cannot be applied to cans that are molded. On the other hand, if the intrinsic viscosity of the resin exceeds 1.4, the melt viscosity when the resin is heated and melted becomes extremely high, and it becomes extremely difficult to laminate the polyester resin film on the surface-treated steel sheet.

[0023] In the case of a single layer film, the thickness of the resin film is preferably 5 to 100 m, more preferably 10 to 40 μm. If the thickness is less than 5 μm, the process of laminating the surface-treated steel sheet becomes extremely difficult, and the resin layer after drawing or drawing and ironing is defective and immediately formed into a can. When filled, the permeation resistance to corrosive components is not sufficient. When the thickness is increased, the permeation resistance becomes sufficient. The thickness exceeding 100 / z m is economically disadvantageous. In the case of a multilayer film, the ratio of the thickness of each layer varies from the viewpoint of molding processability, permeation resistance, or the effect on the flavor of the contents, but the total thickness should be 5-60 / ζ πι. In addition, the thickness of each layer is adjusted.

[0024] Further, when film forming a resin film, the film is formed by adding a coloring pigment, a stabilizer, an antioxidant, a lubricant, etc. to the extent that the necessary properties are not impaired in the resin. You can do it. In addition, a polyester resin film that does not contain pigment is applied to the surface used on the inner surface of the can, and a metal sheet that is laminated with a polyester resin film containing a pigment such as acid titanium on the outer surface of the can. May be used.

[0025] As a method of laminating the organic resin film, the organic resin film may be directly or with an adhesive interposed in the heated surface-treated steel sheet. Also, melted rosin

Alternatively, an extrusion lamination method of directly laminating the surface-treated steel sheet may be applied. As these laminating methods, known methods can be applied.

Example

Hereinafter, the present invention will be described in more detail with reference to examples.

(Examples 1 to 10, Comparative Examples 1 to 3)

As test plates, a transparent polyester film with a thickness of 28 μm on the inner surface side of an electrolytic chromic acid-treated steel plate with a thickness of 0.200 mm, an acid with a thickness of 16 μm on the outer surface side of the can body. B) An organic resin-coated steel sheet coated with a white polyester film added with a titanium pigment was used. After punching a 154mm diameter circular blank from this organic resin-coated steel sheet, a 91mm diameter drawn cup was formed by the first stage drawing, and then the second stage drawing 66 A squeezing cup with a diameter of mm was used. Using this cup, a punch having a small-diameter portion or a tapered portion 2b such that the ironing rate of the opening end of the can body of the present invention is 15% or less, and a ironing device comprising a single-stage ironing portion are used. Ironing was performed under the conditions shown in 1. For comparison, an ironing punch was also used without a small-diameter portion at the upper end where no ironing was applied to a can used for conventional ironing.

[0028] In this test, four types of punches were used to reduce the ironing degree of the opening end of the can body. For both punches, the position force of 130mm from the tip of the punch (can bottom) was tapered, and the diameter was reduced to 63mm. In Table 1, for punches with small diameter, the taper angle from 130mm was 10 degrees.

[0029] [Table 1]

(Examples 11 to 20, Comparative Examples 4 to 9)

Next, the case where the dies are continuously arranged will be described in more detail in Examples. As a test plate, the thickness is 0.2 mm on the inner surface side of the electrolytic chromic acid-treated steel plate. A 28 μm thick transparent polyester film and an organic resin-coated steel sheet coated with a white polyester film with a 16 μm thick titanium oxide pigment added to the outer surface of the can body were used. After punching a 148 mm diameter circular blank from this organic resin-coated steel sheet, a 91 mm diameter drawn cup was formed by the first drawing process, and then a 66 mm diameter drawn cup was produced by the second drawing process. This cup has a small-diameter portion that is not subjected to ironing at the opening end portion of the can body of the present invention, and is the same punch as the punch used in paragraph number [0028]. Using a processing machine, ironing was performed under the conditions shown in Table 2. For comparison, an ironing punch was also used without a small-diameter portion at the open end where the ironing process was not performed on the can used for conventional ironing.

[0031] [Table 2]

[0032] From the thickness measurement of the side wall of the can body before and after the ironing process under each ironing condition, the center of the can side wall (height from the bottomed part 60mm) and the opening end of the can body (the lowest can height part) The ironing rate of lmm lower) was calculated. For the ironing rate of 60mm in height, The amount of deformation in the radial direction and the total ironing rate of the front, rear and front and rear stages were calculated. Furthermore, the moldability of the can under each ironing condition and the condition of the greave hair were observed visually and with an optical microscope, and evaluated according to the following criteria. In addition, the state of deformation of the can body when the can body was pulled out from the punch was visually observed, and the can pull-out property (hereinafter referred to as stripping property) of the punch force of the can body was also evaluated.

[0033] [Formability of can body]

◯: Can be formed into a can body without hindrance.

Δ: Can be molded without breaking the side wall of the can body, but the open end of the can body has not reached the predetermined height.

X: The side wall of the can body broke during ironing.

[Can height]

◯: The can height reaches the small diameter part at the top of the punch or the small diameter part due to the taper

X: The can height does not reach the small diameter part at the top of the punch or the small diameter part due to the taper.

Garden hair]

◯: No linseed hair is recognized.

X: Occasional hair is generated, which is a practical problem.

[Stripping]

◯: Can body can be removed from the punch of the can body.

The opening end of the can body is slightly deformed, but there is no practical problem.

X: The can body is deformed, which causes a practical problem.

These evaluation results are shown in Tables 3 and 4.

[0034] [Table 3] No. Can side wall thickness / mm Ironing ratio /% Can height Resin ift 6.0 mm Can body opening port ι¾ length 50 mm Can body opening end Hair Comparative example 1 0. 121 0. 168 47. 8 47.2 o X Comparative Example 2 0. 117 0. 164 49. 6 48. 4 〇 X Comparative Example. 3 0. 139 0. 255 40. 1 19.6 XX Example 1 0. 130 0. 318 44. 0 0. 0 〇 o Example 2 0. 125 0. 318 46-1 0. 0 O o Example 3 0. 121 0. 318 47. 8 0. 0 〇〇 Example 4 0. 117 0. 318 49 6 0. 0 〇 o Example 5 0. 125 0. 271 46.1 1 14.8 〇〇 Example 6 0. 117 0. 279 49. 6 12.3 o 〇 Example 7 0. 125 0. 288 46. 1 9. 4 ○ ○ Example 8 0. 117 0. 295 49. 6 7. 2 ○ ○ Example 9 0. 125 0. 302 46. 1 5. 0 ○ ○ Example 10 0. 117 0. 312 49. 6 1. 9 ○ ○.

Four]

No Can wall thickness Corrosion rate / o / o Post-stage iron Resin hair strip of can body Height 3 β 0 mm ft Body open A end Forming die of processing die Bubbling height 60 mm Can body open end Front stage Rear stage TOTAL Deformation amount / mm

Comparative Example 4 0. 1 2 1 0. 1 82 ― 5 1. 2 51. 2 44. 8 0. 03 1 0 XX Comparative Example 5 0. 1 1 7 0. 1 90 ― ■ 52. 0 52. 0 42 4 0. 027 ○ XX Comparative example 6 0. 1 1 2 ― ― 54. 8 54. 8 ― 0. 027 X ― Comparative example 7 0. 096 0. 144 4 1. 0 32. 5 60. 0 56. 4 0. 006 OX o Comparative example 8 0. 094 0. 1 45 4 1. 0 34. 1 60. 8 56. 1 0. 004 OX o Comparative example 9 0. 1 1 0 0. 225 1 3. 9 46 9 54. 2 3 1. 8 0, 020 Δ X Δ Example 1 1 0. 1 03 0. 286 2 1. 9 45. 3 57. 1 1 3. 3 0. 0 1 3 O O O Example 1 2 0. 1 00 0. 297 3 1. 9 39. 3 58. 3 10. 0 0. 010 OO 0 Example 1 3 0. 096 0. 303 4 1. 0 32. 5 60. 0 8. 2 0. 006 o O O Example 14 0. 094 0. 3 1 5 50. 2 2 1. 8 60. 8 4. 5 0. 004 O OO Example 1 5 0. 086 0. 32 1 4 1. 0 33. 2 60. 4 2. 7 0. 005 o O Yes Example 1 6 0. 096 0. 324 4 1. 0 34. 1 60. 8 1. 8 0. 004 0 O Yes Example 1 7 0. 086 0. 322 4 1. 0 38. 8 64. 2 2. 4 0. 006 o O 〇 Example 1 8 0. 096 0. 283 4 1. 0 32. 5 60. 0 14. 2 0. 006 ooo Example 1 9 0. 096 0. 326 4 1. 0 32. 5 60. 0 1. 2 0. 006 ○ oo Implementation 20 0. 096 0. 3 18 4 1. 0 32. 5 60. 0 0. 0 0. 006 o 〇 o

[0036] As shown in Table 3, when the squeezing rate of the open end of the can body was 0 to 15%, the opening end of the can body was squeezed in the squeezing process of the organic resin-coated metal sheet. It is possible to mold a squeezed iron can without generating resin hair in the part.

[0037] In addition, as shown in Table 4, in the drawing and ironing process of the organic resin-coated metal sheet when using the continuous dies, the oiled hair generated at the opening end of the can body is generated by the ironing process. It is possible to form a squeezed iron can without having to. Furthermore, the conventional ironing method improves the limit ironing rate per ironing cage, which is about 55% in the conventional ironing process, to about 64%, and reduces the radial deformation of the ironing die in the latter stage of the conventional ironing method. It can be kept below 50%. In addition, the ironing process is divided into a front stage and a rear stage to reduce the residual stress of the compression generated in the circumferential direction of the can body, and a thick wall portion is formed at the opening end of the can body to open the can body. By improving the strength of the end portion, the stripping property can be improved. Industrial applicability

[0038] By using the method of the present invention, in the squeezing and squeezing process of the organic sachet-coated metal plate, the sachet hair is not generated at the opening end of the can body by the squeezing process. In addition, by setting the distance between the lands between dies to 3 to 40 mm, the limit ironing rate per step of ironing that is about 55% in conventional ironing is improved to about 64%, and the latter stage It is possible to suppress the radial deformation of the ironing Karoe die to 50% or less of the conventional ironing method.

Claims

The scope of the claims

[1] A resin-coated metal sheet obtained by coating a metal sheet coated with an organic resin on at least one side of the metal sheet using a punch and a die to form a can body. A grease coating, characterized by using a punch with a small-diameter portion at the rear end, and ironing so that the ironing power of the open end of the can after molding is 15%. Drawing and ironing method for metal plates.

[2] A plurality of dies are used as dies for ironing, and at least two dies are arranged so that the distance between lands is 3 to 40 mm, and more than 20% of the total amount of ironing by the two dies. 2. The drawing and ironing method for a resin-coated metal sheet according to claim 1, wherein the ironing is performed by using the former die of the two dies.

[3] The resin-coated metal sheet according to any one of claims 1 to 2, wherein the ironing process is performed by installing the front die and the rear die in a continuous state on the two dies. Ironing method.

[4] A squeezed and ironed can of a resin-coated metal sheet formed by using the ironing method according to any one of claims 1 to 3.